Today — sit it out — wave, wind and surge pounding.
Sources & confidence
Compiled by the spearo sea-state engine · How it works →
The verdict comes from seven water factors and hard safety gates — not ten tabs. Go or stay.
Our own model
Our own forecast engine — not a third-party widget. It weighs these water factors into one go-or-stay verdict for this coast; the 0–10 dial is that verdict, read out as a number.
Safety gates
It all folds into a single 0–10 score and one verdict: go or stay.
A forecast, not a guarantee — the sea has the last word.
Where to get in, where to hunt
Leave your email — and the moment a window opens at Llantwit Major, we'll send the go / no-go verdict. Email is all we need.
What's missing? Tell us what you'd like to see — new spots, species, data or features. We read everything.
Wind, wave and the swell windows — when to go and the best hours.
The day is picked above, in the hero. Here are that day's windows, the hour-by-hour map and the trends. Tap a window to break down the conditions.
Visibility and what drives it — post-storm clearing, river plume, temperature and the thermocline.
spearo.app folds wind, wave, swell period, visibility, tides, water temperature and risk into a single verdict — go to the spot or not. It computes 7 days ahead from open marine models (Open-Meteo, IPMA), with no sign-up and no accounts. Built for solo spearfishing off the rocks, where any mistake costs dearly.
Now live: 3016 spots across 406 stretches of coast — mainland Portugal, Madeira and the Azores.
See all spotsRelief and bottom type, tides, and the depths of each spot.
The models set the window. Whether you go in is read only at the water: count the sets, watch the surge on the entry. If in doubt, you don't get in.
Scouted entries, coloured by today. The colour is the sea state at the spot, not a guarantee: the wash and a slippery entry you judge on site.
Open the seafloor mapA bay 4 km south-east of Llantwit Major; enter from the shore at its sides where rock meets sand. The coast at Llantwit Major faces south. Go on a calm day near high water, when offshore winds settle the swell; check tide times first.
Google MapsA bay 2 km south-east of Llantwit Major; enter from the shore at its sides where rock meets sand. The coast at Llantwit Major faces south. Go on a calm day near high water, when offshore winds settle the swell; check tide times first.
Google MapsCameras, map and reference — to hand as you come up.
Recreational spearfishing in the sea is legal in the UK without a licence — breath-hold only is the norm. Never spear salmon, sea trout or eels (Salmon and Freshwater Fisheries Act 1975). Bass: catch-and-release only 1 Feb–31 Mar (rod and line), then 3 a day, 42 cm min. Check the local IFCA/Marine Scotland/DAERA rules — in Cornwall no spearfishing dusk to dawn or with scuba. No-take zones (Lundy, Lamlash Bay, Flamborough) are closed.
A bay 2 km south-west of Llantwit Major; enter from the shore at its sides where rock meets sand. The coast at Llantwit Major faces south. Go on a calm day near high water, when offshore winds settle the swell; check tide times first.
SOLO is the biggest risk: underwater you can black out from lack of oxygen silently and fatally, with no one around. Solo is never truly «safe». Below are the best weather windows; carry a buoy, tell someone your plan and exit time, and any doubt — don't go.
Llantwit Major has rock entry points such as Stout Bay, Tresilian bay and Penry Bay. Llantwit Major is a coastal town facing south. Below you'll find each spot (access, shelter and hazards) and today's forecast.
May–October; Atlantic gales in winter; Pembrokeshire clears on calm summer days.
8–9 °C in March, 15–17 °C in August — 7 mm in winter, 5 mm in summer.
Rocky Pembrokeshire and Anglesey coasts with strong tidal races (Ramsey Sound, the Skerries); Skomer MCZ off St Davids. No licence; bass rules apply.
Llantwit Major: Recreational spearfishing in the sea is legal in the UK without a licence — breath-hold only is the norm. Never spear salmon, sea trout or eels (Salmon and Freshwater Fisheries Act 1975). Bass: catch-and-release only 1 Feb–31 Mar (rod and line), then 3 a day, 42 cm min. Check the local IFCA/Marine Scotland/DAERA rules — in Cornwall no spearfishing dusk to dawn or with scuba. No-take zones (Lundy, Lamlash Bay, Flamborough) are closed.
transparency nearby ~2 m · satellite, yesterdaysatellite estimate · may differ right at the shore
